part_of part of part of corolla collective phyllome structure keel quilla (Spanish, exact) PO:0025327 A boat-shaped collective phyllome structure (PO:0025023) that consists of the two lowest petals (PO:0009032) of a papilionaceous corolla (PO:0009059). 竜骨（イネ科）、舟弁（マメ科） (Japanese, exact) plant_anatomy 2011-09-15T02:09:23Z The two petals of the keel are often fused at the apex and free at the base. The keel projects toward the front of the flower. Found in the flowers of some Fabaceae. rwalls